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Патент USA US2127505

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Aug. 23, 1938.
A. l.. EMENS
2,127,505
ELECTRIC METER
Filed Feb. 29, 1932
'2 Sheets-Sheet
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Aug. 23, 1938.
2,127,505
A. 1_. EMENS
ELECTRIC METER
Filed Feb. 29, 1952
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2 Sheets-Sheet
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Patented Aug. 23, 1938
_ 2,127,505
UNITED STATES
PATENT OFFICE
2,127,505
ELECTRIC METER
Albert L. Emens, La Fayette, Ind., assigner to
Duncan Electric Manufacturing Company,
La Fayette, Ind., a corporation of Illinois
Application February 29, 1932, Serial No. 595,804
a claims. (ci. r11-_34)
This invention relates to electric meters, and
especially to the type known as maximum demand
meters, although in some of its aspects it may be
used for other purposes. AÍ maximum demand
meter of the type chosen for the illustration of
this invention includes in addition to such ordi-'
needle had been moved during the month. Ac
cording to former practice, the reader would re
cord the position of `this sweephand (with an
accuracy depending upon his honesty and care~
fulness) and would reset the sweephand to zero 5
so that the process would begin over again.
nary killowatt hour meter features as may be
According to the present invention, the maxi
used, a device for indicating the greatest demand
inany period of a given length. For example,
lo besides having the usual features for-indicating
the total kilowatt hours used during the month,
mum demand is registered permanently in a man
the maximum demand meter may have a pointer
which indicates the greatest amount of energy
used in any uiteen-minute period during the
15V month.
It should be understood that one purpose of
a maximum demand meter is to enable the power
company to more equitably bill its customers,
since the consumer who uses only a small amount
‘_‘ii of current each month, but who occasionally has
an excessive demand, requires the companyv 'to'
have expensive facilities for meeting his demand.
In other words, the demand register enables the
power company to bill the consumers not only
l0 di according to the amount of current they use, but
also according to their proportionate share of the
overhead involved in providing equipment for
meeting the peak demand, and in providing the
necessary transmission facilities for his own in
?0 dividual maximum demand.
The maximum demand indicating function may
be performed by providing a needle which is auto
matically snapped back to zero every fifteen min
utes. It follows that the movement of that needle
ner to substantially eliminate the difficulties due
to dishonesty or careless reading of the demand 1G
indications. Not only are the rights of the com
pany thus protected, but the consumer is much
better satisfied, since otherwise there is a strong
tendency for him to feel that perhaps he is being
overcharged.
r
Occasionally it is necessary to inspect and test
the meters, and when this is done it has been
necessary in the past for the inspector to be pres
ent at the end of the regular fifteen-minute
period in order to check the snap-back of the 20
snap-back needle to zero. lf the inspector should
start to check this feature at the beginning of
the fifteen-minute period, it has formerly been ~
necessary for him to wait the full fifteen minutes.
According to one aspect of this invention, the 25
necessity for this wait is avoided by providing
means whereby the inspector may readily turn
the mechanism up manually to end the period
ahead of time, just as a clock inspector might
turn the hands of a clock ahead to the hour in 3Q
order to check the chimes. In the present in
-stance, however, there would be no undesirable
results from this setting up.
'
In its preferred form, this invention includes
-, , by the meter disk during any period (for example, ‘ a reset- lever vfor turning the sweephand back to 35
`zero, an integrator which is operated by this
sweephand when it is being set back, and one-way
clutches which prevent the sweephand from oper
ating said integrator while it is being turned for
which is not returned to zero, but remains at
40: the highest point to which said snap-back- de
ward by the meter disk, and for preventing the 40
mand needle was moved. Thus, if during the turning of the re-set lever in the wrong direction.
first fifteen-minute period the snap-back demand ' This renders the device substantially foolproof,
needle shoved the maximum demand needle or for when the meter reader has once displaced the
sweephand around to the numeral 10, and was
re-set lever, it is necessary for him to turn it a
452 then set back to Zero, it would not again move- complete revolution in order to get it back to its 45
the maximum demand meter during any period sealing position, and in so doing, the meter reader
in which the demand was less than the ten units' must turn the sweephand all the way back to
indicated by the ñrst period. However, if in a zero, and he cannot turn it forward.
As a further safeguard, a counter may be used
later period the demand should be, for example,
so 12 units, then in that period the snap-back de
whichwill count the number of times that the 50
re-set Vlever is operated. This would have the
mand needle would move around to the point 12
shoving the sweephand from 10 to l2. When the added advantage that it would permit a deter
meter reader comes around he can see from the~ mination from the face of the meter at any time
position of the maximum demand needle the fur
of the average demand since the cumulative in
fifteen minutes) will indicate the demand in that
period. This snap-back demand needle may
move- another pointer, called the sweephand,
thest point to which the snap-back demand.
tegrator was last set to zero.
,
55-
2
9,127,505
In another aspect the preferred form o! the
invention comprises the use of an over-running
clutch in the timing mechanism so that this
mechanism may be set up without interference
with the timing motor, but wherever it is set the
motor will immediately begin to function. In
this connection, there are added advantages in
that the set-up device will indicate that the timer
is in operation, and may be calibrated in minutes
ll) both to aid the operator in setting it up and to
provide a handy timing device for various meterI
testing purposes.
With these and various other objects in view,
the invention may consist of certain novel fea
tures of construction and operation, as will be
more fully described and particularly pointed out
in the specification, drawings and claims ap
pended hereto.
In the drawings, which illustrate an embodi
20 ment of the device, and wherein like reference
characters are used to designate like parts,
Figure 1 is a iront elevation of a meter em
bodying this invention;
Figure 2 is a view of certain parts of the mech
25 anism taken along the line 2-2 of Figure 1;
Figure 3 is a fragmentary sectional view taken
substantially along the line of line 3-3 of Fig
ure 2;
Figure 4 is a side view partly in section, of
30 the structure shown in Figure 3;
Figure 5 is a fragmentary front sectional view
illustrating the cumulative demand recording
features;
Figure 6 is a detail view of the re-set mecha
35 nism and its means for operating the cumulative
demand integrator;
Figure 'I is a diagrammatic view illustrat
ing various operative features of this invention;
Figures 8 and 9 are detail views of the re-set
40
device; and
Figures 10, 11, 12 and 13 are detail views of
the over-running clutches, Figure 10 relating to
the reset mechanism, Figure 11 to the cumula
tive demand integrator drive, and Figures 12
45 and 13 to the drive for the snap-back mecha
nism.
Although my invention may take many forms,
only one has been chosen for illustration. 'I'his
form is embodied in an electric meter, as shown
in Figure l. This meter may include the usual
hands I and dial calibrations 2 for indicating
the total kilowatt hours measured by the meter.
In addition to this there may be the usual de
mand calibrations l with the maximum demand
indicating needle l, more commonly called the
sweephand, and the mechanism for operating the
same.
It is in connection with this mechanism
that this invention is preferably used.
This
mechanism is best illustrated diagrammatically
in Figure 7.
'I'he sweephand 5 .is rotatably
mounted on the shaft 3 and is actuated oy a
member 'I which may for convenience be termed
the snap-back needle. This snap-back needle is
keyed to the shaft 6, and co-acts with an upright
portion I in the sweephand I. The shaft 3
is driven by any suitable gear Il, which is driven
by the electric meter disk in the same manner
as are the pointers I of the power consumption
indicator. 'I'his gear Ill meshes with the gear
10 I2 which drives the shaft 6 through the friction
clutch I3. 'I‘his clutch I3 slips with compara
tively ligbt friction. so that when the shaft is
snapped back by being turned counterclockwise
back to the aero indication the shaft 3 will also
turn without injurious resistance.
f
In order that the sweephand l may indicate
the maximum demand during any fifteen
minute period between meter readings, means
are provided to set the snap-back needle 1 back
to zero every fifteen minutes.
Of course the
period may be other than ñfteen minutes, but
for the sake of simplicity of discussion this de
scription will throughout be based on the nfteen
minute period. 'I'he snap back of the snap-back
needle 1 is accomplished through the pinion Il.
on the shaft t and the pivoted rack l1 mounted
on the pin I3. The snap-back action is stopped
at the zero position by the eccentric Il which
limits the return movement of rack I'l. A snap
back lever 20 actuated by the spring 2l, and also
pivoted on the pin I8 together with a cam 23
for controlling the snap-back lever 23, and the
means for operating said cam, is provided. Aa
the driving gear Ill turns the shaft 6 and the
snap-back needle 'l in a clockwise direction, it
also turns the pinion I6 likewise, swinging the
rack I 1 to the right. ‘This movement of the
rack is not normally resisted by the snap-back
lever 20 since the cam 23 has pressed the snap
back lever 2li out of range of the rack Il. This
cam is driven constantly by means to be de
scribed, and when it has made a complete revo
lution in the direction of the arrow the cam fol
lower 24 on lever 20 is released from the rim 2l
of the cam and under the force of the spring 2|
falls into the notch 26 in the cam, pressing the
rack il back to its starting position, which posi
tion is the zero position for the snap-tuck
needle 1.
The cam 23 is driven through a train of gears
28 by the gear 29. The gear 2B is driven by the
shaft 3i through a one-way clutch 30 (to be
described). The shaft 3l is preferably driven by `
a self-starting synchronous motor, such as that
used in electric clocks.
-
The meter is preferably sealed in any suitable
manner, visibility of the apparatus being permit
ted by the glass cover 32 in the usual manner.
This glass cover is provided with a hole 3l co
axial with shaft 6 through which is fitted the
set-back mechanism. Around the hole 34 are
formed suitable glass bosses 35. Over the upper
boss is applied a cap 3G which is provided with
a depressed portion 31 which fits into notches
in the glass boss, and into which may be fitted `
a lug 38 on a stationary clutch member 33.
This member may be shaped substantially as
shown in Figure 10. Fitting over this stationary
clutch member 39 is a movable clutch member ‘l
to which is pivoted a handle 4I about the hori- ,
zontal pivots I2. As shown in Figure 10 there
is located between the stationary clutch mem
ber 39 and the movable clutch member 4l, a
clutch roller 44 which is normally pressed by a
spring l5 toward the narrow end of a clutch slot i
46 formed in the stationary clutch member, as
shown. It is evident that a movement of the
movable clutch member 40 in a clockwise direc
tion would only tighten the clutch roller Il so
that this movement is prevented. A rotation of 1
the movable clutch member 40 in a counterclock
wise direction, however, loosens the roller 44.
whereby the free rotation of the movable clutch
member is permitted.
The parts are held in the position described 1
by a stud 48 and the nuts I9. This stud 43 is of
course rigidly secured to the outer clutch mem
ber l0 and is turned with it by the set-back lever
4I. Keyed to the stud 4l but on the inside of
the glass cover 32 is a set-back disk Il (Fig. 9) 1
2,127,505
to which is pivoted the lever 52 carrying at one
end a set-back pin 53, and being acted upon
at the other end by a spring 54 which tends to
press the set-back pin outwardly. In its outer
Cl position the set-back pin 53 engages the sweep
hand just outside the vertical portion 8. It fol
lows that when the lever 4l is turned the pin 53
will strike the sweephand 5 and turn the same
counterclockwise until it is released therefrom.
The release is accomplished by means of a cam
56 which. as shown best in Figure l, is so shaped
as to press the set back pin 53 inwardly and
cause its release from the sweephand.
It may be noted at this point that various dials
used for different meter purposes may have the
zero point for the sweephand at slightly different
positions. In order to cause the release of the
sweephand at the zero position, the cam 56 is
made adjustable by supporting it from a ring
58 which is secured by screws 59 extending
through slots in the usual manner; However,
this can be dispensed with by forming as a cam
the portion of the sweephand engaged by pin
53, so that when the sweephand is stopped at the
zero position by the snap-back needle, the cam
surface on the needle will become effective to
overcome the spring 54 and press the pin 53 in
ward to enable it to slip free of the sweephand 5.
As‘has previously been common practice, it is
30 desirable to seal the re-set mechanism in an in
active position so that it may not be tampered
with. In the present instance this is accomplished
by means of an arm 68 which has an upstanding
lug 6i extending from and preferably integral
with the cap 36 which as previously described is
locked against rotary motion by the depressed
portion 31 which ñts into a corresponding notch
in the glass boss 35. The lug 6l and the set
back lever 4I are perforated, as indicated at 62,
40 so that when these parts are in the position
shown in Figure 6 a wire may be passed through
them and sealed with the customary lead seal.
65 turns the gear 66 on the shaft 61 to which
is secured the pointer 6B. This train of gearing
is also shown in Figure 5. From this ñgure it is
seen that the shaft 51 also carries a pinion 69
which turns the gears 18 and their associated
pointers 1I in the usual manner. Pointers 68
and 1| with their associated dial markings com
prise a cumulative demand integrator.
It has previously been recognized as desirable
that a minimum of power to be used in operating 10
an electric meter. For this reason, it is preferred
that the sweephand 5 be operated freely in its
movement by the meter, leaving the operation
of the pointers 68 and 1I to the return stroke
of the sweephand 5. To accomplish this the one 15
way clutch mechanism 13 is provided. 'I‘his
mechanism comprises an inner clutch member
14 rigidly connected to the gear 64 and with it
freely rotatable on the shaft 6. Around the in
ner clutch member 14 is the -outer clutch mem
20
ber 15 which, as shown best in Figure 6 is rigidly
secured to the sweephand 5 by means of the col
lar 16 which is rotatably mounted on the shaft 6.
This outer clutch member 15 constitutes a hous
ing and together with the inner clutch member 25
14 forms a clutch raceway 80 in which is carried
the roller 19 actuated toward the small end of
the raceway by the spring 18. Due to the nature
of this over-running clutch the hand 5 may be
turned freely in a clockwise direction by the me 30
ter mechanism, but when it is turned counter
clockwise in resetting, it causes the clutch to en
gage, and therefore turns the gear 64. ’I‘urning
of the gear 64 in a counterclockwise direction,
through the train of gears‘65 causes the pointer 35
68 to turn in a clockwise direction. 'I'he ratio in
the train of gears 65 is such that the resetting
of sweephand 5 turns the integrator including
pointer 68 through a number of graduations cor
In the present invention this locking together has
responding to the number of graduations through
which the sweephand 5 is rotated. In other
words, if the sweephand 5 has been moved to the
position l2 on its scale, the resetting of the sweep
an additional advantage in that it requires the
meter reader to make a complete set-back op
eration. Inasmuch as the one-way clutch roller
44 prevents rotation of the set-back lever 4I ex
cept in a counterclockwise direction, it is impos
pointers 68 and 1I. It is therefore substantially 45
impossible for the meter reader to falsify the de
mand readings without detection, since he will
read the cumulative total of the pointers 68 and
sible for a meter reader after he has once un
sealed the lever 4I and started turning it, to again
seal it until he has turned it through a complete
revolution. The set-back pin 53 is so related with
respect to the locking position of the set-back
lever 4I that when the lever is locked the set
back pin is in an inactive position at the bottom
part of its cycle, that is, between the cam 56 and
the furthest point of movement of the sweep
hand. This insures a complete reset of the sweep
hand to zero when the reset lever 4l is turned one
60
3 .
revolution.
_
In meters formerly known commercially, the
re-setting of the sweephand to zero left no record
of what the sweephand had previously registered.
Neither the customer nor the company would
have any way of knowing whether or not the me
hand to zero will add 12- to the reading of the
1|, rather than, or as well as the position of the
sweephand 5. Of course, the difference between 50
the reading of the integrator including the point
ers 68 and .1I before and after a given re-setting
of the sweephand 5, will indicate the reading of
the sweephand prior to the said re-setting.
As a further safeguard against improper 0p 55
eration, and for other purposes, a counter may be
provided for registering the number of times the
re-setting mechanism has been operated. It is
evident that a simple division of the increase in
reading of the needles 68 and 1| by the increase
in the total number of re-set operations on such
a counter will give the average of the various de
mand readings during a given period.
As previously stated, it is sometimes desirable
to'inspect and test the meter, such an inspection 65
ter reader correctly read the demand indication.
should include a check up on the snap-back op
According to the present invention, however,
eration of the snap-back needle 1. However, this
snap-back occurs only when the cam 23 is in
the position shown. In prior commercial devices,
these maximum demand indications are perma
nently and cumulatively registered every time the
sweephand is re-set. The mechanism which ap
plicant has devised for performing this is quite
simple.
As illustrated diagrammatically in Figure 7,
the sweephand in its return movement turns the
75 gear 64 which, through a suitable train of gears
this cam was driven directly by a synchronous 70
electric motor, with the result that there was no
Way yto hurry the occurrence of the snap-back.
According to the present invention, the over
running or one-way clutch 30 is provided between
the shaft 3l and the gear 29. This permits the 75
4
alamo»
gear 2| to be turned even though the motor or
the gearing associated with the same (not shown)
prevents the turning of the shaft Il. Means are
necessary, and so that the meter reading oi the
definite time of the set-back may be taken any
time prior to the next automatic set-back. When
this is done. it may also be desirable to provide
an extra integrator operative in conjunction with
provided for conveniently turning the gear 2l,
this means comprising the pinion I2 meshing with
the gear 2i and keyed to the shaft B3, which is
suitably journaled, as shown. The shaft I8 is
the integrator including pointers i, and set back
to zero whenever the snap-back needle is set
back, so that the reading of the total- power con
sumption may be made at any time, as of the
last automatic set back. Under these conditions, 10
the reading at the time of the last set-back can
provided with an extension having a head Il pro
iecting to the front of the meter dial and pro~
vided with a slot for a screw driver, as shown
best in Figures 2 and 3. This permits the turning
of the cam 2l by a screw driver applied to the
head B4, so that the meter tester may quickly
at any time be determined by subtracting the
reading of the auxiliary integrator just men
tioned from the reading of the pointers I.
turn the cam to the position at which the snap
back takes place.
It is to be understood that many other em-‘
As a matter of further convenience this head
84 is providedwith an arrow to indicate its
proper direction of rotation, and a pointer which
may point to suitable calibrations on the dial,
as shown in Figure 3, which calibrations may
bodiments of the invention, including some in
improved form, will be apparent, and in the
course of time more will be devised by those
skilled in the art. It is not desired that this
invention be limited to the details described, for
its scope includes all such forms or improve
indicate minutes or other intervals of time. . This
will not only aid the tester in knowing the po
siticn of the cam 23, but it will also provide a
convenient timer for any other purpose.
ments as come within the spirit of the following
claims, construed as broadly as the prior art will
permit.
In or
der to prevent tampering with the head I4 it is
located underneath the glass cover 32, but this
is not objectionable, as the head 84 is turned by
hand only during testing, at which time the cover
32 is removed for other reasons.
- What is claimed is:
1. An electric maximum demand meter in
cluding a pusher element, means constantly
tending to move said pusher element forwardly
in proportion to the power consumption, snap
The meter
30 reader need never remove the cover, since the
back means for causing the return of said pusher
element after the lapse oi a given period, and
manually operable means for causing the opera
tion of said snap-back means in advance of its
set-back lever 4I is on the outside of the cover,
and since the friction clutch I3 permits the set
back of the sweephand 5 and the snap-back nee
dle 1 to the zero position regardless of the po
sition of the cam 23.
In view of the foregoing description, the op
schedule; said manually operable means having
a portion visible during ordinary meter read
ings, said part being rotated by said return means
in its normal operation, whereby the meter reader
eration need only be briefly reviewed. Dur
ing the ordinary running of the meter the snap
back needle ‘I is rotated clockwise by the meter
40 drive, shifting the sweephand 5 ahead of it for
successive periods of say fifteen minutes each.
At the end of each period the snap-back needle
1 is set back to zero through operation of the
rack il of the spring pressed lever 2U, as it is
s. LA
can readily see whether or not said first named
means is in operation.
2. An electric maximum demand meter in
cluding a pusher element, means constantly
tending to move said pusher element forwardly
in proportion to the power consumption, snap
back means for causing the return of said pusher
element after the lapse of a given period, and
manually -operable means for causing the oper
released by the cam 23, the cam 2l being con
stantly rotated, preferably by a suitable synchro
nous motor. When the meter is read, the set
back lever 4i is unsealed and lifted from the lug
6I and rotated in a counterclockwise direction
to sweep the sweephand 5 back to zero. When
the hand reaches this position, the lever Il is
released from its co-action with the hanu by the
pressing in of the peg 53 under the influence of
the cam 56. The lever 4| is then again sealed
to the lug 6i. As the sweephand 5 was rotated
counterclockwise as above described, it turned the
gear 64 through the medium of the one-way
clutch 13 and this gear 64 through suitable other
gears turned the pointers 68 and ‘Il an amount
60 corresponding to the amount that the sweep
hand was set back, i. e., an amount corresponding
to what had been the reading of the sweephand.
The meter reader can make- sure that the syn
chronous motor is operating by merely glancing
. at the head 8l which will be rotated by the motor.
This head 84 may also be turned with a screw
driver after the case 32 has been removed, in or
der to rotate'the cam 2l to the position which
permits the snap-back of the snap-back needle
A 1, thus rendering the inspection of this feature
quite simple.
It should be realized, of course, that if desired,
means may be provided for rendering the set
back operation automatic, so that manual oper
ations by the meter reader will be entirely un
ation of said snap-back means in advance of its
.
schedule; said manually operable means having
a portion visible during ordinary meter readings,
said part being rotated by said snap-back means
in its normal operation whereby the meter reader
can readily see whether or not sa'id iirst named
means is in operation, and indicating means as
sociated with said visible moving portion to serve
as a convenient measurer of time.
55
3. An electric maximum demand meter in
cluding a pusher element, means constantly
tending to move said pusher element forwardly
in proportion to the power consumption, snap
back means including a snap-back release mem
ber for causing the return of said pusher element
after the lapse of a given period, and manually
operable means for causing the operation of said
snap-back release member in advance of its
schedule; said snap-back means including a nor
mal source of power continuously operating at
constant speed, and mechanical means directly
driven by said source of power and directly driv
ing said snap-back release member including a'
one-way drive between said source of power and 70
said driven release member which is constructed
to allow said driven release member to be driven
faster than its normal speed without altering the
natural movement oi' the normal source of power.
4. An electric maximum demand meter in- 'l5
2,197,505
5
indicating independently the demand in succes
sive periods, means for causing a return of said
pusher element at the end of each such period,
a sweephand operated by said pusher element to
the point of its greatest movement, a cover for
consumption, return means for causing the snap said meter mechanism, a re-set device rotatably
back of said pusher element after the lapse of carried by the cover and the operation of which
a given period, manually operable means for is necessary for setting back said sweephand to
causing the operation of the effective part of said' zero, an integrator operated by said sweephand
snap-back means in advance of its schedule; said in its setting back movement to indicate the ex
cluding a meter mechanism and a case for said
mechanism adapted to be sealed against tamper
ing, said mechanism including a pusher element,
means constantly tending to move said pusher
element forwardly in proportion to the power
snap-back means including a normal source of
power, and a one-way drive arranged to permit
the movement of the part thereof operated by
said manually operable means while the natural
f' movement of the normal source of power is main
tained; said manually operable means being con
nected to drive said effective part and located
in a position to be readily accessible when said
casing is opened but inaccessible within said
casing when said casing is closed and sealed.
5. An electric maximum demand meter in-'
cluding a pusher element, means constantly
tending to move said pusher element forwardly
in proportion to the power consumption, snap
back means for causing the snap back of said
pusher element after the lapse of a given period,
and manually operable means for causing the
operation of said snap-back means in advance
of its schedule; said manually operable means
having a portion visible during ordinary meter
readings, said part being rotated by said snap
back means ín its normal operation whereby the
meter' reader can readily see whether or not said
first named means is in operation, and calibra
tions associated with said visible moving portion
to serve as a convenient measurer of time and
aiding the tester in determining the proximity in
time of the next snap back operation.
6. An electric maximum demand meter having
tent of said movement, means for sealing said re
set device in an inactive position, and one-way
movement means including a first member im
movably secured to the cover, a second member
rotatable with the device and at a fixed angular
position with respect to the device, a one-way
locking element carried by one of said members.
and a spring urging the locking element into
engagement with >the other of said members one
of said elements being so notched where it is
engaged by the locking element as to positively
prevent movement of said device except in the
resetting direction, while permitting movement in
the resetting direction. and means for causing the
release of said re-set device from said sweephand
when said sweephand reaches the zero position.
8. An electric demand meter comprising a
meter mechanism including a pusher element for
indicating independently the demand in succes
sive periods, means for causing a return of said
pusher element at the end of each such period, a
sweephand operated by said pusher element to
the point of its greatest movement, a cover for
said meter mechanism, a re-set device rotatably
carried by the cover and the operation of which
is necessary for setting back said sweephand to
zero, an integrator operated by said sweephand
in its setting back movement to indicate the ex
tent of said movement, said re-set device includ
a case and including within the case an angularly
ing a handle external of the cover and a sweep
movable pusher element, means constantly tend
hand-engaging member positioned inside the
ing to move said pusher element forwardly' in
proportion to the power consumption, spring op
erated means for causing the return of said
angular position with respect to the handle,
pusher element to its starting point after the
lapse of a given period, maximum demand indi
cating means operated by said pusher element to
a position corresponding to its greatest move
ment, and including a shoulder movable arcuate
ly through less than 360°; and reset means in
cover and rotatable with the handle at a fixed
means for sealing said re-set device in a single
position in which position the sweephand-engaging member is out of the range of movement of
the sweephand, and one-way movement means in
cluding a first member immovably secured to the
cover, a second member rotatable with the han
dle and at a fixed angular position with respect
50 cluding a member within the case movable to the handle, a one-way locking element carried
through a cycle of 360° and engaging said shoul
by one of said members, and a spring urging the
der during part of said cycle to return said in
locking element into engagement with the other
dicating means to its zero position, and movable of said members one of said elements being so
during a subsequent part of its cycle to a position notched where it is engaged by the locking ele
Ul of rest angularly outside of the angular move
ment as to positively prevent movement of said
ment of said shoulder; an integrator operated by 'handle except in the resetting direction, while
said indicating means as it is set back to zero to
permitting movement in the resetting direction.
indicate exactly the amount of its set-back
movement.
7. An- electric demand meter comprising a
meter mechanism including a pusher element for
and means for causing the release of said re-set
device from said sweephand when said sweep
hand reaches the zero position.
ALBERT L. EMENS.
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